Improvement in fire-proof roofs



v 2 Sheets-Sheet Z S. FARQKUHAR. FIRE-P300? RGOFS.

No. 195,594, lPanzani-.ed SW1-25.1871 A Mgg UNITED STATES PATENT OFFICE.

SAMUEL EARQHAE, oE BOSTON, MASSAcHUSETTS, ASSIGNOR To HIMSELF AND DAVID w. EARQUHAE, 0E SAME PLACE.

lMPROVEMENT IN FIRE-PROOF ROQFS.

Specification forming part of Letters Patent No. 195,594, datedseptember 25, 1877; application filed July 28, 1877.

To all whom it may concern Beit known that l, SAMUEL FARQUHAE, of Boston, in the county ot' Suffolk and State of Massachusetts. have invented an Improvement in Fire-Proof Roofs, of which the fol-V lowing 'is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this speciiication, in'

Which- Figure 1 is a perspective view of a roof constructed in accordance with my invention. Fig. 2 is a vertical section through the same; Fig. 3, sectional detail.

My present invention consists in a roof composed of wooden rafters, covered with sheet metal or other fire-proof material, and iron purlins or beams, with the slates or other covering secured thereto by clasps, or in any other suitable manner, in connection with a tire-proofceincnt or composition rendered77 or laid within the space inclosed by the ruiters and pnrlins immediately under and i'n contact with the slatcs or covering ot' the roof, by which construction I dispense with the usc of thc boards ordinarily employed for nailing the slates thereto, yand produce a roof thoroughlyv nre-proof at every point, andiin which the condensation of moisture and staining oi' ceilings, incident to many of the root'sof the present construction, are entirelyavoided.

To enable others skilled in the art to understand and use my invention, I will proceed to V States Letters Patent No. 138,999, granted to i myself (Samuel Farquhar) May 20, 1873; or,

the slates may be fastened to the purlins Iin any other suitable manner.

After thereof is covered with slates, the space immediately thereunder, inclosed by the purlins and rafters, is rendered or filled with a fire-prooi' cement, mortar, or other Acoinposition, H, of a thickness sufficient to secure.

the necessary protection against fire, this tireproof material being Securely clinched in place upon and around the iianges or L of the iron purlins, and when dry forms an impenetrable barrier to re and a non-conductor for heat or cold, while, at the Sametime, all condensation 'and dropping of moisture and the discolorin g of ceilings incident to the ordinary construction of roofs ist thereby avoided.

A roof constructed in accordance with my invention is also preferable to a roof constructed wholly of iron, as inthis latter case,

in the event ot' a tire, an intense heat -would warp and twist the iron portions suciently to cause the breaking and opening of theroof.

Moreover, a roof ot' my improved construction does not require so heavy walls to sustain it', while' the number of the rafters is diminished, and all rooting-boards for attaching slates thereto, heretofore required, are dispensed with, and the damage incident to the contraction and expansion oi' roofs formed wholly of iron is also avoided.

What I claim as my invention, and desire to secure by Letters Patent, is.

A lire-proof roof, having in its construction wooden rafters D covered with sheet metal or other fire-proof material, and iron purlins E, in combination. with a lire-proof covering seo cured thereto, and a backing, H, of reproof cement or other composition placed thereunder in the space between the rafters and the purlins, substantially as described, for the purpose set forth.

Witness my hand this 26th day of July, A. D. 1877. Y

N. W. STEARNS, W. J. GAMnnrooE. 

